Delta Air Lines has ordered 15 more Airbus A220 aircraft, bringing to 90 the total of the type the Atlanta-based carrier has on order.

Delta placed its initial order for 75 A220-100s in 2016. The additional orders are the airline’s first for the -300 model. Delta also converted earlier A220 orders to the larger -300, bringing to 50 the number of A220-300s on order.

The aircraft, formerly the Bombardier CSeries 100, was rebranded the A220-100 in July 2018 after Airbus took control of the CSeries program.